Examples of java.nio.ByteBuffer.compact()

java.nio.ByteBuffer.compact()
Compacts this byte buffer.
The remaining bytes will be moved to the head of the buffer, staring from position zero. Then the position is set to remaining(); the limit is set to capacity; the mark is cleared.
@return This buffer @exception ReadOnlyBufferException If no changes may be made to the contents of this buffer


        final byte[] bytes = "hello world".getBytes();


        ByteBuffer writeonlybuffer = rwChannel.map(FileChannel.MapMode.READ_WRITE, 0, bytes.length);
        writeonlybuffer.put(bytes);
        writeonlybuffer.compact();
    }


    private File writeToFile2(InputStream archive, String name) throws IOException {
        final File file = File.createTempFile("deploy", "-" + name);
        final FileOutputStream outputStream = new FileOutputStream(file);

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      if (! Arrays.equals(magic, METABLOCKMAGIC)) {
        throw new IOException("Meta magic is bad in block " + block);
      }
      // Toss the header. May have to remove later due to performance.
      buf.compact();
      buf.limit(buf.limit() - METABLOCKMAGIC.length);
      buf.rewind();
      return buf;
    }
    /**

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        buf.get(magic, 0, magic.length);
        if (!Arrays.equals(magic, DATABLOCKMAGIC)) {
          throw new IOException("Data magic is bad in block " + block);
        }
        // Toss the header. May have to remove later due to performance.
        buf.compact();
        buf.limit(buf.limit() - DATABLOCKMAGIC.length);
        buf.rewind();


        // Cache the block
        if(cacheBlock && cache != null) {

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                            readBuffer.put(readBytes);


                            readBuffer.flip();


                            recognizeMessageAndDispatch(readBuffer);
                            readBuffer.compact();
                        }
                    }while(readBytesLen > 0);
                    }
                    catch(SocketException ex)
                    {

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      if (! Arrays.equals(magic, METABLOCKMAGIC)) {
        throw new IOException("Meta magic is bad in block " + block);
      }
      // Toss the header. May have to remove later due to performance.
      buf.compact();
      buf.limit(buf.limit() - METABLOCKMAGIC.length);
      buf.rewind();
      return buf;
    }
    /**

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        buf.get(magic, 0, magic.length);
        if (!Arrays.equals(magic, DATABLOCKMAGIC)) {
          throw new IOException("Data magic is bad in block " + block);
        }
        // Toss the header. May have to remove later due to performance.
        buf.compact();
        buf.limit(buf.limit() - DATABLOCKMAGIC.length);
        buf.rewind();


        // Cache the block
        if(cacheBlock && cache != null) {

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        try {
            while (decoder.read(inbuf) > 0) {
                inbuf.flip();
                sink.write(inbuf);
                inbuf.compact();
            }


            if (decoder.isCompleted()) {
                if (sink != null) sink.close();
                if (!connStrategy.keepAlive(response, context)) {

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            if (bytesRead == -1) {
                encoder.complete();
            } else {
                outbuf.flip();
                encoder.write(outbuf);
                outbuf.compact();
            }


            if (encoder.isCompleted()) {
                source.close();
            }

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        try {
            while (decoder.read(inbuf) > 0) {
                inbuf.flip();
                sink.write(inbuf);
                inbuf.compact();
            }


            if (decoder.isCompleted()) {
                sink.close();
            }

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            if (bytesRead == -1) {
                encoder.complete();
            } else {
                outbuf.flip();
                encoder.write(outbuf);
                outbuf.compact();
            }


            if (encoder.isCompleted()) {
                source.close();
                if (!connStrategy.keepAlive(response, context)) {

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